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<head>
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    <title>Document</title>
    <style>
        *{
            margin: 0;
            padding: 0;
            list-style: none; 
        }
        #box{
            width: 100%;
            height: 500px;
            overflow: hidden;
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        #box>div{
            width: 800px;
            height: 500px;
            margin: 0 auto;
            /* background-color: #ff4b4b; */
            overflow: hidden;
            margin-top: 50px;
        }
        #box>div>div:first-child{
            width: 300px;
            height: 180px;
            overflow: hidden;
            margin: 0 auto;
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        #box>div>div:first-child>img{
            width: 300px;
            height: 180px;
        }
        #box>div>div:last-child{
            border: 1px solid #a4a4a4;
            border-radius:5px;
            width: 500px;
            height: 50px;
            margin: 0 auto;
            margin-top: 20px;
            overflow: hidden;
            /* background-color: aqua; */
        }
        #box>div>div:last-child>input{
            width: 400px;
            height: 50px;
            outline: none;
            border: none;
            vertical-align: top;
            border-radius: 5px 0 0 5px;
        }
        #box>div>div:last-child>div{
            width: 100px;
            height: 50px;
            background-color: #3451f5;
            float: right;
            text-align: center;
            line-height: 50px;
            color: rgb(255, 255, 255);
            border-radius: 0 5px 5px 0;
        }
    </style>
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<body>
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            <div><img src="https://www.baidu.com/img/PCtm_d9c8750bed0b3c7d089fa7d55720d6cf.png"></div>
            <div><input type="text" placeholder="郭晶晶68岁母亲汉奸偶棉"><div>百度一下</div></div>
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